Oeko Popo covers, inserts and sleeves (or information on where I can buy these)

I bought one of these covers on FSOT and I LOVE it, it's my new favorite cover, so I, of course, need more. I'd also like to try out the inserts that come with them, and the sleeves? you can put the inserts into.

Please PM me if you have any of this for sale or if you know of a retailer I can purchase them from. I haven't been able to find them anywhere!!